Can I put 15 inch rims on a 2008 chevy trailblazer?

If you can find 15 inch rims for your 2008 trailblazer yes.The 2008 trailblazer comes factory with 17 and 18 inch rims according to model.If you were to install 15 inch rims it would seriously cause problems with the stability,handling and braking performance of this truck.Best of luck.